1/* 2 * Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at> 3 * Copyright (C) 2006 Robert Edele <yartrebo@earthlink.net> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#ifndef AVCODEC_SNOW_H 23#define AVCODEC_SNOW_H 24 25#include "libavutil/motion_vector.h" 26 27#include "hpeldsp.h" 28#include "me_cmp.h" 29#include "qpeldsp.h" 30#include "snow_dwt.h" 31 32#include "rangecoder.h" 33#include "mathops.h" 34 35#include "mpegvideo.h" 36#include "h264qpel.h" 37 38#define SNOW_MAX_PLANES 4 39 40#define FF_ME_ITER 3 41 42#define MID_STATE 128 43 44#define MAX_PLANES 4 45#define QSHIFT 5 46#define QROOT (1<<QSHIFT) 47#define LOSSLESS_QLOG -128 48#define FRAC_BITS 4 49#define MAX_REF_FRAMES 8 50 51#define LOG2_OBMC_MAX 8 52#define OBMC_MAX (1<<(LOG2_OBMC_MAX)) 53typedef struct BlockNode{ 54 int16_t mx; ///< Motion vector component X, see mv_scale 55 int16_t my; ///< Motion vector component Y, see mv_scale 56 uint8_t ref; ///< Reference frame index 57 uint8_t color[3]; ///< Color for intra 58 uint8_t type; ///< Bitfield of BLOCK_* 59//#define TYPE_SPLIT 1 60#define BLOCK_INTRA 1 ///< Intra block, inter otherwise 61#define BLOCK_OPT 2 ///< Block needs no checks in this round of iterative motion estiation 62//#define TYPE_NOCOLOR 4 63 uint8_t level; //FIXME merge into type? 64}BlockNode; 65 66static const BlockNode null_block= { //FIXME add border maybe 67 .color= {128,128,128}, 68 .mx= 0, 69 .my= 0, 70 .ref= 0, 71 .type= 0, 72 .level= 0, 73}; 74 75#define LOG2_MB_SIZE 4 76#define MB_SIZE (1<<LOG2_MB_SIZE) 77#define ENCODER_EXTRA_BITS 4 78#define HTAPS_MAX 8 79 80typedef struct x_and_coeff{ 81 int16_t x; 82 uint16_t coeff; 83} x_and_coeff; 84 85typedef struct SubBand{ 86 int level; 87 int stride; 88 int width; 89 int height; 90 int qlog; ///< log(qscale)/log[2^(1/6)] 91 DWTELEM *buf; 92 IDWTELEM *ibuf; 93 int buf_x_offset; 94 int buf_y_offset; 95 int stride_line; ///< Stride measured in lines, not pixels. 96 x_and_coeff * x_coeff; 97 struct SubBand *parent; 98 uint8_t state[/*7*2*/ 7 + 512][32]; 99}SubBand; 100 101typedef struct Plane{ 102 int width; 103 int height; 104 SubBand band[MAX_DECOMPOSITIONS][4]; 105 106 int htaps; 107 int8_t hcoeff[HTAPS_MAX/2]; 108 int diag_mc; 109 int fast_mc; 110 111 int last_htaps; 112 int8_t last_hcoeff[HTAPS_MAX/2]; 113 int last_diag_mc; 114}Plane; 115 116typedef struct SnowContext{ 117 AVClass *class; 118 AVCodecContext *avctx; 119 RangeCoder c; 120 MECmpContext mecc; 121 HpelDSPContext hdsp; 122 QpelDSPContext qdsp; 123 VideoDSPContext vdsp; 124 H264QpelContext h264qpel; 125 MpegvideoEncDSPContext mpvencdsp; 126 SnowDWTContext dwt; 127 AVFrame *input_picture; ///< new_picture with the internal linesizes 128 AVFrame *current_picture; 129 AVFrame *last_picture[MAX_REF_FRAMES]; 130 uint8_t *halfpel_plane[MAX_REF_FRAMES][4][4]; 131 AVFrame *mconly_picture; 132// uint8_t q_context[16]; 133 uint8_t header_state[32]; 134 uint8_t block_state[128 + 32*128]; 135 int keyframe; 136 int always_reset; 137 int version; 138 int spatial_decomposition_type; 139 int last_spatial_decomposition_type; 140 int temporal_decomposition_type; 141 int spatial_decomposition_count; 142 int last_spatial_decomposition_count; 143 int temporal_decomposition_count; 144 int max_ref_frames; 145 int ref_frames; 146 int16_t (*ref_mvs[MAX_REF_FRAMES])[2]; 147 uint32_t *ref_scores[MAX_REF_FRAMES]; 148 DWTELEM *spatial_dwt_buffer; 149 DWTELEM *temp_dwt_buffer; 150 IDWTELEM *spatial_idwt_buffer; 151 IDWTELEM *temp_idwt_buffer; 152 int *run_buffer; 153 int colorspace_type; 154 int chroma_h_shift; 155 int chroma_v_shift; 156 int spatial_scalability; 157 int qlog; 158 int last_qlog; 159 int lambda; 160 int lambda2; 161 int pass1_rc; 162 int mv_scale; 163 int last_mv_scale; 164 int qbias; 165 int last_qbias; 166#define QBIAS_SHIFT 3 167 int b_width; 168 int b_height; 169 int block_max_depth; 170 int last_block_max_depth; 171 int nb_planes; 172 Plane plane[MAX_PLANES]; 173 BlockNode *block; 174#define ME_CACHE_SIZE 1024 175 unsigned me_cache[ME_CACHE_SIZE]; 176 unsigned me_cache_generation; 177 slice_buffer sb; 178 int memc_only; 179 int no_bitstream; 180 int intra_penalty; 181 int motion_est; 182 int iterative_dia_size; 183 int scenechange_threshold; 184 185 MpegEncContext m; // needed for motion estimation, should not be used for anything else, the idea is to eventually make the motion estimation independent of MpegEncContext, so this will be removed then (FIXME/XXX) 186 187 uint8_t *scratchbuf; 188 uint8_t *emu_edge_buffer; 189 190 AVMotionVector *avmv; 191 unsigned avmv_size; 192 int avmv_index; 193 uint64_t encoding_error[SNOW_MAX_PLANES]; 194 195 int pred; 196}SnowContext; 197 198/* Tables */ 199extern const uint8_t * const ff_obmc_tab[4]; 200extern const uint8_t ff_qexp[QROOT]; 201extern int ff_scale_mv_ref[MAX_REF_FRAMES][MAX_REF_FRAMES]; 202 203/* C bits used by mmx/sse2/altivec */ 204 205static av_always_inline void snow_interleave_line_header(int * i, int width, IDWTELEM * low, IDWTELEM * high){ 206 (*i) = (width) - 2; 207 208 if (width & 1){ 209 low[(*i)+1] = low[((*i)+1)>>1]; 210 (*i)--; 211 } 212} 213 214static av_always_inline void snow_interleave_line_footer(int * i, IDWTELEM * low, IDWTELEM * high){ 215 for (; (*i)>=0; (*i)-=2){ 216 low[(*i)+1] = high[(*i)>>1]; 217 low[*i] = low[(*i)>>1]; 218 } 219} 220 221static av_always_inline void snow_horizontal_compose_lift_lead_out(int i, IDWTELEM * dst, IDWTELEM * src, IDWTELEM * ref, int width, int w, int lift_high, int mul, int add, int shift){ 222 for(; i<w; i++){ 223 dst[i] = src[i] - ((mul * (ref[i] + ref[i + 1]) + add) >> shift); 224 } 225 226 if((width^lift_high)&1){ 227 dst[w] = src[w] - ((mul * 2 * ref[w] + add) >> shift); 228 } 229} 230 231static av_always_inline void snow_horizontal_compose_liftS_lead_out(int i, IDWTELEM * dst, IDWTELEM * src, IDWTELEM * ref, int width, int w){ 232 for(; i<w; i++){ 233 dst[i] = src[i] + ((ref[i] + ref[(i+1)]+W_BO + 4 * src[i]) >> W_BS); 234 } 235 236 if(width&1){ 237 dst[w] = src[w] + ((2 * ref[w] + W_BO + 4 * src[w]) >> W_BS); 238 } 239} 240 241/* common code */ 242 243int ff_snow_common_init(AVCodecContext *avctx); 244int ff_snow_common_init_after_header(AVCodecContext *avctx); 245void ff_snow_common_end(SnowContext *s); 246void ff_snow_release_buffer(AVCodecContext *avctx); 247void ff_snow_reset_contexts(SnowContext *s); 248int ff_snow_alloc_blocks(SnowContext *s); 249int ff_snow_frame_start(SnowContext *s); 250void ff_snow_pred_block(SnowContext *s, uint8_t *dst, uint8_t *tmp, ptrdiff_t stride, 251 int sx, int sy, int b_w, int b_h, const BlockNode *block, 252 int plane_index, int w, int h); 253int ff_snow_get_buffer(SnowContext *s, AVFrame *frame); 254/* common inline functions */ 255//XXX doublecheck all of them should stay inlined 256 257static inline void pred_mv(SnowContext *s, int *mx, int *my, int ref, 258 const BlockNode *left, const BlockNode *top, const BlockNode *tr){ 259 if(s->ref_frames == 1){ 260 *mx = mid_pred(left->mx, top->mx, tr->mx); 261 *my = mid_pred(left->my, top->my, tr->my); 262 }else{ 263 const int *scale = ff_scale_mv_ref[ref]; 264 *mx = mid_pred((left->mx * scale[left->ref] + 128) >>8, 265 (top ->mx * scale[top ->ref] + 128) >>8, 266 (tr ->mx * scale[tr ->ref] + 128) >>8); 267 *my = mid_pred((left->my * scale[left->ref] + 128) >>8, 268 (top ->my * scale[top ->ref] + 128) >>8, 269 (tr ->my * scale[tr ->ref] + 128) >>8); 270 } 271} 272 273static av_always_inline int same_block(BlockNode *a, BlockNode *b){ 274 if((a->type&BLOCK_INTRA) && (b->type&BLOCK_INTRA)){ 275 return !((a->color[0] - b->color[0]) | (a->color[1] - b->color[1]) | (a->color[2] - b->color[2])); 276 }else{ 277 return !((a->mx - b->mx) | (a->my - b->my) | (a->ref - b->ref) | ((a->type ^ b->type)&BLOCK_INTRA)); 278 } 279} 280 281//FIXME name cleanup (b_w, block_w, b_width stuff) 282//XXX should we really inline it? 283static av_always_inline void add_yblock(SnowContext *s, int sliced, slice_buffer *sb, IDWTELEM *dst, uint8_t *dst8, const uint8_t *obmc, int src_x, int src_y, int b_w, int b_h, int w, int h, int dst_stride, int src_stride, int obmc_stride, int b_x, int b_y, int add, int offset_dst, int plane_index){ 284 const int b_width = s->b_width << s->block_max_depth; 285 const int b_height= s->b_height << s->block_max_depth; 286 const int b_stride= b_width; 287 BlockNode *lt= &s->block[b_x + b_y*b_stride]; 288 BlockNode *rt= lt+1; 289 BlockNode *lb= lt+b_stride; 290 BlockNode *rb= lb+1; 291 uint8_t *block[4]; 292 // When src_stride is large enough, it is possible to interleave the blocks. 293 // Otherwise the blocks are written sequentially in the tmp buffer. 294 int tmp_step= src_stride >= 7*MB_SIZE ? MB_SIZE : MB_SIZE*src_stride; 295 uint8_t *tmp = s->scratchbuf; 296 uint8_t *ptmp; 297 int x,y; 298 299 if(b_x<0){ 300 lt= rt; 301 lb= rb; 302 }else if(b_x + 1 >= b_width){ 303 rt= lt; 304 rb= lb; 305 } 306 if(b_y<0){ 307 lt= lb; 308 rt= rb; 309 }else if(b_y + 1 >= b_height){ 310 lb= lt; 311 rb= rt; 312 } 313 314 if(src_x<0){ //FIXME merge with prev & always round internal width up to *16 315 obmc -= src_x; 316 b_w += src_x; 317 if(!sliced && !offset_dst) 318 dst -= src_x; 319 src_x=0; 320 } 321 if(src_x + b_w > w){ 322 b_w = w - src_x; 323 } 324 if(src_y<0){ 325 obmc -= src_y*obmc_stride; 326 b_h += src_y; 327 if(!sliced && !offset_dst) 328 dst -= src_y*dst_stride; 329 src_y=0; 330 } 331 if(src_y + b_h> h){ 332 b_h = h - src_y; 333 } 334 335 if(b_w<=0 || b_h<=0) return; 336 337 if(!sliced && offset_dst) 338 dst += src_x + src_y*dst_stride; 339 dst8+= src_x + src_y*src_stride; 340// src += src_x + src_y*src_stride; 341 342 ptmp= tmp + 3*tmp_step; 343 block[0]= ptmp; 344 ptmp+=tmp_step; 345 ff_snow_pred_block(s, block[0], tmp, src_stride, src_x, src_y, b_w, b_h, lt, plane_index, w, h); 346 347 if(same_block(lt, rt)){ 348 block[1]= block[0]; 349 }else{ 350 block[1]= ptmp; 351 ptmp+=tmp_step; 352 ff_snow_pred_block(s, block[1], tmp, src_stride, src_x, src_y, b_w, b_h, rt, plane_index, w, h); 353 } 354 355 if(same_block(lt, lb)){ 356 block[2]= block[0]; 357 }else if(same_block(rt, lb)){ 358 block[2]= block[1]; 359 }else{ 360 block[2]= ptmp; 361 ptmp+=tmp_step; 362 ff_snow_pred_block(s, block[2], tmp, src_stride, src_x, src_y, b_w, b_h, lb, plane_index, w, h); 363 } 364 365 if(same_block(lt, rb) ){ 366 block[3]= block[0]; 367 }else if(same_block(rt, rb)){ 368 block[3]= block[1]; 369 }else if(same_block(lb, rb)){ 370 block[3]= block[2]; 371 }else{ 372 block[3]= ptmp; 373 ff_snow_pred_block(s, block[3], tmp, src_stride, src_x, src_y, b_w, b_h, rb, plane_index, w, h); 374 } 375 if(sliced){ 376 s->dwt.inner_add_yblock(obmc, obmc_stride, block, b_w, b_h, src_x,src_y, src_stride, sb, add, dst8); 377 }else{ 378 for(y=0; y<b_h; y++){ 379 //FIXME ugly misuse of obmc_stride 380 const uint8_t *obmc1= obmc + y*obmc_stride; 381 const uint8_t *obmc2= obmc1+ (obmc_stride>>1); 382 const uint8_t *obmc3= obmc1+ obmc_stride*(obmc_stride>>1); 383 const uint8_t *obmc4= obmc3+ (obmc_stride>>1); 384 for(x=0; x<b_w; x++){ 385 int v= obmc1[x] * block[3][x + y*src_stride] 386 +obmc2[x] * block[2][x + y*src_stride] 387 +obmc3[x] * block[1][x + y*src_stride] 388 +obmc4[x] * block[0][x + y*src_stride]; 389 390 v <<= 8 - LOG2_OBMC_MAX; 391 if(FRAC_BITS != 8){ 392 v >>= 8 - FRAC_BITS; 393 } 394 if(add){ 395 v += dst[x + y*dst_stride]; 396 v = (v + (1<<(FRAC_BITS-1))) >> FRAC_BITS; 397 if(v&(~255)) v= ~(v>>31); 398 dst8[x + y*src_stride] = v; 399 }else{ 400 dst[x + y*dst_stride] -= v; 401 } 402 } 403 } 404 } 405} 406 407static av_always_inline void predict_slice(SnowContext *s, IDWTELEM *buf, int plane_index, int add, int mb_y){ 408 Plane *p= &s->plane[plane_index]; 409 const int mb_w= s->b_width << s->block_max_depth; 410 const int mb_h= s->b_height << s->block_max_depth; 411 int x, y, mb_x; 412 int block_size = MB_SIZE >> s->block_max_depth; 413 int block_w = plane_index ? block_size>>s->chroma_h_shift : block_size; 414 int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size; 415 const uint8_t *obmc = plane_index ? ff_obmc_tab[s->block_max_depth+s->chroma_h_shift] : ff_obmc_tab[s->block_max_depth]; 416 const int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size; 417 int ref_stride= s->current_picture->linesize[plane_index]; 418 uint8_t *dst8= s->current_picture->data[plane_index]; 419 int w= p->width; 420 int h= p->height; 421 av_assert2(s->chroma_h_shift == s->chroma_v_shift); // obmc params assume squares 422 if(s->keyframe || (s->avctx->debug&512)){ 423 if(mb_y==mb_h) 424 return; 425 426 if(add){ 427 for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){ 428 for(x=0; x<w; x++){ 429 int v= buf[x + y*w] + (128<<FRAC_BITS) + (1<<(FRAC_BITS-1)); 430 v >>= FRAC_BITS; 431 if(v&(~255)) v= ~(v>>31); 432 dst8[x + y*ref_stride]= v; 433 } 434 } 435 }else{ 436 for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){ 437 for(x=0; x<w; x++){ 438 buf[x + y*w]-= 128<<FRAC_BITS; 439 } 440 } 441 } 442 443 return; 444 } 445 446 for(mb_x=0; mb_x<=mb_w; mb_x++){ 447 add_yblock(s, 0, NULL, buf, dst8, obmc, 448 block_w*mb_x - block_w/2, 449 block_h*mb_y - block_h/2, 450 block_w, block_h, 451 w, h, 452 w, ref_stride, obmc_stride, 453 mb_x - 1, mb_y - 1, 454 add, 1, plane_index); 455 } 456} 457 458static av_always_inline void predict_plane(SnowContext *s, IDWTELEM *buf, int plane_index, int add){ 459 const int mb_h= s->b_height << s->block_max_depth; 460 int mb_y; 461 for(mb_y=0; mb_y<=mb_h; mb_y++) 462 predict_slice(s, buf, plane_index, add, mb_y); 463} 464 465static inline void set_blocks(SnowContext *s, int level, int x, int y, int l, int cb, int cr, int mx, int my, int ref, int type){ 466 const int w= s->b_width << s->block_max_depth; 467 const int rem_depth= s->block_max_depth - level; 468 const int index= (x + y*w) << rem_depth; 469 const int block_w= 1<<rem_depth; 470 const int block_h= 1<<rem_depth; //FIXME "w!=h" 471 BlockNode block; 472 int i,j; 473 474 block.color[0]= l; 475 block.color[1]= cb; 476 block.color[2]= cr; 477 block.mx= mx; 478 block.my= my; 479 block.ref= ref; 480 block.type= type; 481 block.level= level; 482 483 for(j=0; j<block_h; j++){ 484 for(i=0; i<block_w; i++){ 485 s->block[index + i + j*w]= block; 486 } 487 } 488} 489 490static inline void init_ref(MotionEstContext *c, uint8_t *src[3], uint8_t *ref[3], uint8_t *ref2[3], int x, int y, int ref_index){ 491 SnowContext *s = c->avctx->priv_data; 492 const int offset[3]= { 493 y*c-> stride + x, 494 ((y*c->uvstride + x)>>s->chroma_h_shift), 495 ((y*c->uvstride + x)>>s->chroma_h_shift), 496 }; 497 int i; 498 for(i=0; i<3; i++){ 499 c->src[0][i]= src [i]; 500 c->ref[0][i]= ref [i] + offset[i]; 501 } 502 av_assert2(!ref_index); 503} 504 505 506/* bitstream functions */ 507 508extern const int8_t ff_quant3bA[256]; 509 510#define QEXPSHIFT (7-FRAC_BITS+8) //FIXME try to change this to 0 511 512static inline void put_symbol(RangeCoder *c, uint8_t *state, int v, int is_signed){ 513 int i; 514 515 if(v){ 516 const int a= FFABS(v); 517 const int e= av_log2(a); 518 const int el= FFMIN(e, 10); 519 put_rac(c, state+0, 0); 520 521 for(i=0; i<el; i++){ 522 put_rac(c, state+1+i, 1); //1..10 523 } 524 for(; i<e; i++){ 525 put_rac(c, state+1+9, 1); //1..10 526 } 527 put_rac(c, state+1+FFMIN(i,9), 0); 528 529 for(i=e-1; i>=el; i--){ 530 put_rac(c, state+22+9, (a>>i)&1); //22..31 531 } 532 for(; i>=0; i--){ 533 put_rac(c, state+22+i, (a>>i)&1); //22..31 534 } 535 536 if(is_signed) 537 put_rac(c, state+11 + el, v < 0); //11..21 538 }else{ 539 put_rac(c, state+0, 1); 540 } 541} 542 543static inline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed){ 544 if(get_rac(c, state+0)) 545 return 0; 546 else{ 547 int i, e; 548 unsigned a; 549 e= 0; 550 while(get_rac(c, state+1 + FFMIN(e,9))){ //1..10 551 e++; 552 if (e > 31) 553 return AVERROR_INVALIDDATA; 554 } 555 556 a= 1; 557 for(i=e-1; i>=0; i--){ 558 a += a + get_rac(c, state+22 + FFMIN(i,9)); //22..31 559 } 560 561 e= -(is_signed && get_rac(c, state+11 + FFMIN(e,10))); //11..21 562 return (a^e)-e; 563 } 564} 565 566static inline void put_symbol2(RangeCoder *c, uint8_t *state, int v, int log2){ 567 int i; 568 int r= log2>=0 ? 1<<log2 : 1; 569 570 av_assert2(v>=0); 571 av_assert2(log2>=-4); 572 573 while(v >= r){ 574 put_rac(c, state+4+log2, 1); 575 v -= r; 576 log2++; 577 if(log2>0) r+=r; 578 } 579 put_rac(c, state+4+log2, 0); 580 581 for(i=log2-1; i>=0; i--){ 582 put_rac(c, state+31-i, (v>>i)&1); 583 } 584} 585 586static inline int get_symbol2(RangeCoder *c, uint8_t *state, int log2){ 587 int i; 588 int r= log2>=0 ? 1<<log2 : 1; 589 int v=0; 590 591 av_assert2(log2>=-4); 592 593 while(log2<28 && get_rac(c, state+4+log2)){ 594 v+= r; 595 log2++; 596 if(log2>0) r+=r; 597 } 598 599 for(i=log2-1; i>=0; i--){ 600 v+= get_rac(c, state+31-i)<<i; 601 } 602 603 return v; 604} 605 606static inline void unpack_coeffs(SnowContext *s, SubBand *b, SubBand * parent, int orientation){ 607 const int w= b->width; 608 const int h= b->height; 609 int x,y; 610 611 int run, runs; 612 x_and_coeff *xc= b->x_coeff; 613 x_and_coeff *prev_xc= NULL; 614 x_and_coeff *prev2_xc= xc; 615 x_and_coeff *parent_xc= parent ? parent->x_coeff : NULL; 616 x_and_coeff *prev_parent_xc= parent_xc; 617 618 runs= get_symbol2(&s->c, b->state[30], 0); 619 if(runs-- > 0) run= get_symbol2(&s->c, b->state[1], 3); 620 else run= INT_MAX; 621 622 for(y=0; y<h; y++){ 623 int v=0; 624 int lt=0, t=0, rt=0; 625 626 if(y && prev_xc->x == 0){ 627 rt= prev_xc->coeff; 628 } 629 for(x=0; x<w; x++){ 630 int p=0; 631 const int l= v; 632 633 lt= t; t= rt; 634 635 if(y){ 636 if(prev_xc->x <= x) 637 prev_xc++; 638 if(prev_xc->x == x + 1) 639 rt= prev_xc->coeff; 640 else 641 rt=0; 642 } 643 if(parent_xc){ 644 if(x>>1 > parent_xc->x){ 645 parent_xc++; 646 } 647 if(x>>1 == parent_xc->x){ 648 p= parent_xc->coeff; 649 } 650 } 651 if(/*ll|*/l|lt|t|rt|p){ 652 int context= av_log2(/*FFABS(ll) + */3*(l>>1) + (lt>>1) + (t&~1) + (rt>>1) + (p>>1)); 653 654 v=get_rac(&s->c, &b->state[0][context]); 655 if(v){ 656 v= 2*(get_symbol2(&s->c, b->state[context + 2], context-4) + 1); 657 v+=get_rac(&s->c, &b->state[0][16 + 1 + 3 + ff_quant3bA[l&0xFF] + 3*ff_quant3bA[t&0xFF]]); 658 if ((uint16_t)v != v) { 659 av_log(s->avctx, AV_LOG_ERROR, "Coefficient damaged\n"); 660 v = 1; 661 } 662 xc->x=x; 663 (xc++)->coeff= v; 664 } 665 }else{ 666 if(!run){ 667 if(runs-- > 0) run= get_symbol2(&s->c, b->state[1], 3); 668 else run= INT_MAX; 669 v= 2*(get_symbol2(&s->c, b->state[0 + 2], 0-4) + 1); 670 v+=get_rac(&s->c, &b->state[0][16 + 1 + 3]); 671 if ((uint16_t)v != v) { 672 av_log(s->avctx, AV_LOG_ERROR, "Coefficient damaged\n"); 673 v = 1; 674 } 675 676 xc->x=x; 677 (xc++)->coeff= v; 678 }else{ 679 int max_run; 680 run--; 681 v=0; 682 av_assert2(run >= 0); 683 if(y) max_run= FFMIN(run, prev_xc->x - x - 2); 684 else max_run= FFMIN(run, w-x-1); 685 if(parent_xc) 686 max_run= FFMIN(max_run, 2*parent_xc->x - x - 1); 687 av_assert2(max_run >= 0 && max_run <= run); 688 689 x+= max_run; 690 run-= max_run; 691 } 692 } 693 } 694 (xc++)->x= w+1; //end marker 695 prev_xc= prev2_xc; 696 prev2_xc= xc; 697 698 if(parent_xc){ 699 if(y&1){ 700 while(parent_xc->x != parent->width+1) 701 parent_xc++; 702 parent_xc++; 703 prev_parent_xc= parent_xc; 704 }else{ 705 parent_xc= prev_parent_xc; 706 } 707 } 708 } 709 710 (xc++)->x= w+1; //end marker 711} 712 713#endif /* AVCODEC_SNOW_H */ 714